Chemistry: electrical and wave energy – Processes and products
Patent
1977-11-16
1978-08-29
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
203 42, C25B 308
Patent
active
041101774
ABSTRACT:
A recovery and purification operation in which a perfluorocarboxylic acid fluoride, e.g., trifluoroacetylfluoride, is recovered having a high purity from an electrochemical cell fluorination operation is described. The effluent is compressed and chilled, separation of vapor from liquid phases is effected to produce a liquid which is further chilled and subcooled and employed as absorption medium in an absorption zone. Vapors separated are compressed and chilled and subjected to a further phase separation, vapors from which are passed to the absorption zone. The enriched absorption medium together with liquid from the second phase separation is passed to a fractionation zone for recovery of the perfluorocarboxylic acid fluoride from incompletely fluorinated compounds which can be returned to the cell for further fluorination.
The invention is applicable to the recovery of perfluorocarboxylic acid fluorides of mono- and dicarboxylic acids containing from 2 to about 10 carbon atoms.
REFERENCES:
patent: 2711826 (1955-06-01), Young et al.
patent: 4025567 (1977-05-01), Hutchinson et al.
patent: 4029552 (1977-06-01), Fozzard
Andrews R. L.
Phillips Petroleum Company
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